package com.lagou.utils;


import com.alibaba.druid.pool.DruidDataSourceFactory;

import javax.sql.DataSource;

import java.io.InputStream;

import java.sql.*;

import java.util.Properties;


public class DruidUtils {


    //1.定义成员变量

    public static DataSource dataSource;


    //2.静态代码块

    static {

        try {

            //3.创建属性集对象

            Properties p = new Properties();


            //4.加载配置文件 Druid 连接池不能够主动加载配置文件 ,需要指定文件

            InputStream inputStream = DruidUtils.class.getClassLoader().getResourceAsStream("druid.properties");


            //5. 使用Properties对象的 load方法 从字节流中读取配置信息

            p.load(inputStream);
            System.out.println(p.get("username")+"%%%%%%%%%%%%%%%%");

            //6. 通过工厂类获取连接池对象

            dataSource = DruidDataSourceFactory.createDataSource(p);


        } catch (Exception e) {

            e.printStackTrace();

        }

    }


    //获取连接的方法

    public static Connection getConnection() {


        try {


            return dataSource.getConnection();


        } catch (SQLException e) {

            e.printStackTrace();

            return null;

        }

    }


    //获取Druid连接池对象的方法

    public static DataSource getDataSource() {

        return dataSource;

    }


    //释放资源

    public static void close(Connection con, Statement statement) {


        if (con != null && statement != null) {

            try {

                statement.close();

                //归还连接

                con.close();

            } catch (SQLException e) {

                e.printStackTrace();

            }

        }


    }


    public static void close(Connection con, PreparedStatement statement) {


        if (con != null && statement != null) {

            try {

                statement.close();

                //归还连接

                con.close();

            } catch (SQLException e) {

                e.printStackTrace();

            }

        }


    }


    public static void close(Connection con, Statement statement, ResultSet resultSet) {


        if (con != null && statement != null && resultSet != null) {

            try {

                resultSet.close();

                statement.close();

                //归还连接

                con.close();

            } catch (SQLException e) {

                e.printStackTrace();

            }

        }


    }


    public static void close(Connection con, PreparedStatement statement, ResultSet resultSet) {


        if (con != null && statement != null && resultSet != null) {

            try {

                resultSet.close();

                statement.close();

                //归还连接

                con.close();

            } catch (SQLException e) {

                e.printStackTrace();

            }

        }


    }

}